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PDF MAX2821 Data sheet ( Hoja de datos )
| Número de pieza | MAX2821 | |
| Descripción | 2.4GHz 802.11b Zero-IF Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2493; Rev 5; 5/05
2.4GHz 802.11b Zero-IF Transceivers
General Description
The MAX2820/MAX2820A and MAX2821/MAX2821A
single-chip zero-IF transceivers are designed for the
802.11b (11Mbps) applications operating in the
2.4GHz to 2.5GHz ISM band. The transceivers are
nearly identical, except the MAX2821 and MAX2821A
also provide a low-power shutdown mode and an ana-
log voltage reference output. The MAX2820A/
MAX2821A are cost-reduced versions, virtually identi-
cal in pinout and performance to the MAX2820/
MAX2821. The transceivers include all the circuitry
required to implement an 802.11b RF-to-baseband
transceiver solution, providing a fully integrated
receive path, transmit path, VCO, frequency synthesis,
and baseband/control interface. Only a PA, RF switch,
RF BPF, and a small number of passive components are
needed to form the complete radio front-end solution.
The ICs eliminate the need for external IF and base-
band filters by utilizing a direct-conversion radio archi-
tecture and monolithic baseband filters for both
receiver and transmitter. They are specifically opti-
mized for 802.11b (11Mbps CCK) applications. The
baseband filtering and Rx and Tx signal paths support
the CCK modulation scheme for BER = 10-5 at the
required sensitivity levels.
The devices are suitable for the full range of 802.11b
data rates (1Mbps, 2Mbps, 5.5Mbps, and 11Mbps) and
also the higher-rate 22Mbps PBCCTM standard. The
MAX2820 and MAX2821 are available in a 7mm × 7mm
48-lead QFN package. The MAX2820, MAX2821,
MAX2820A, and MAX2821A are available in a 48-lead
thin QFN package.
Applications
802.11b 11Mbps WLAN
802.11b+ 22Mbps PBCC High-Data-Rate WLAN
802.11a + b Dual-Band WLAN
2.4GHz ISM Band Radios
Features
o 2.4GHz to 2.5GHz ISM Band Operation
o 802.11b (11Mbps CCK and 22Mbps PBCC) PHY
Compatible
o Complete RF-to-Baseband Transceiver
Direct-Conversion Upconverters and
Downconverters
Monolithic Low-Phase-Noise VCO
Integrated Baseband Lowpass Filters
Integrated PLL with 3-Wire Serial Interface
Digital Bias Control for External PA
Transmit Power Control (Range > 25dB)
Receive Baseband AGC (Range > 65dB)
Complete Baseband Interface
Digital Tx/Rx Mode Control
Analog Receive Level Detection
o -97dBm Rx Sensitivity at 1Mbps
o -87dBm Rx Sensitivity at 11Mbps
o +2dBm Transmit Power (11Mbps CCK)
o Single +2.7V to +3.6V Supply
o Low-Current Shutdown Mode (MAX2821 only)
o Very Small 48-Pin QFN Package(s)
Ordering Information
PART
MAX2820ETM-TD
MAX2820ETM+TD
MAX2820AETM-TD
MAX2820AETM+TD
MAX2821ETM-TD
MAX2821ETM+TD
MAX2821AETM-TD
MAX2821AETM+TD
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 Thin QFN
Lead Free
48 Thin QFN
Lead Free
48 Thin QFN
Lead Free
48 Thin QFN
Lead Free
PBCC is a trademark of Texas Instruments, Inc.
Pin Configuration/Functional Diagram and Typical
Application Circuit appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE
(MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, fRF and fLO = 2400MHz to 2499MHz, fOSC = 22MHz or 44MHz, transmit baseband
inputs = 400mVP-P, SHDNB = TX_ON = VIH, RX_ON = VIL, CSB = VIH, 0V ≤ VTX_GC ≤ +2.0V, RBIAS = 12kΩ, ICP = +2mA, BWPLL =
45kHz, differential RF output matched to 50Ω through a balun, baseband input biased at +1.2V, registers set to default power-up set-
tings, TA = +25°C, unless otherwise noted. Typical values are at VCC = +2.7V, fLO = 2437MHz, fOSC = 22MHz, unless otherwise noted.)
PARAMETER
CONDITIONS
TRANSMIT SIGNAL PATH: BASEBAND INPUT TO RF OUTPUT
RF Output Frequency Range
LO Output Frequency Range
MIN TYP MAX UNITS
2400
2400
2499
2499
MHz
MHz
TX RF Output Power
TX RF ACPR (Note 8)
In-Band Spurious Signals Relative to
Modulated Carrier
TX RF Harmonics
TX RF Spurious Signal Emissions
(Outside 2400MHz to 2483.5MHz)
Nonharmonic Signals
TX RF Output Noise
TX RF Output Return Loss
TX BASEBAND FILTER RESPONSE
-3dB Frequency
Attenuation Relative to Passband
TX GAIN-CONTROL CHARACTERISTICS
Gain-Control Range
Gain-Control Slope
Gain-Control Response Time
VIN = 400mVP-P at
5.5MHz,
VTX_GC = 0V,
I/Q CW signal (Note 7)
TA = +25°C
TA = -40°C to
+85°C
-22MHz ≤ fOFFSET ≤ -11MHz,
11MHz ≤ fOFFSET ≤ 22MHz
-33MHz ≤ fOFFSET < -22MHz,
22MHz < fOFFSET ≤ 33MHz
fRF = 2400MHz to
2483MHz
Unwanted sideband
LO signal
Spurs > ±22MHz
2 × fLO
3 × fLO
fRF < 2400MHz
fRF = 2500MHz to 3350MHz
fRF > 3350MHz
fOFFSET ≥ 22MHz, 0V ≤ VTX_GC ≤ +2.0V
With external match
-1
-2
At 22MHz
At 44MHz
0V ≤ VTX_GC ≤ +2.0V
Peak gain slope
VTX_GC = +2.0V to 0V step
+3
-37
-59
-40
-30
-80
-40
-55
-60
-43
-45
-135
15
10
25
50
30
40
0.3
dBm
dBc
dBc
dBm
dBm
dBm/Hz
dB
MHz
dB
dB
dB/V
µs
_______________________________________________________________________________________ 5
5 Page 
2.4GHz 802.11b Zero-IF Transceivers
Pin Configuration/Functional Diagram
48 47 46 45 44 43 42 41 40 39 38 37
VCC_LNA 1
VREF 2
(MAX2821/MAX2821A)
RF_GAIN 3
PROGRAMMING AND
MODE CONTROL
RX LEVEL
DETECTOR
36 SHDNB
35 VCC_RXF
34 VCC_LO
RX_RFN 4
33 VCC_VCO
RX_RFP 5
32 BYP
VCC_REF 6
RBIAS 7
TX_RFP 8
TX_RFN 9
90
MAX2820/
MAX2821 90
0
0
INTEGER-N
SYNTHESIZER
31 TUNE
30 GND_VCO
29 GND_CP
28 CP_OUT
PA_BIAS 10
VCC_DRVR 11
TX_GC 12
∑ VOS COMP
SERIAL
INTERFACE
27 VCC_CP
26 CSB
25 SCLK
13 14 15 16 17 18 19 20 21 22 23 24
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MAX2821.PDF ] | |
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